Improvement in furnaces for roasting ores



WILLIAM BRUCKNER, OF CENTRAL CITY, COLORADO;

IMPROVEMENT lNivFuRNAcEs FOR RoAsTlNfczoRsEs.

Specification forming part of Letters Patent No. 71,448, dated November 26,1867.

To all whom it may concern:

Be it known that I, WILLIAM BRUCKNER, of Central City, Gilpin county, Colorado Territory, have invented certain new and useful Improvements in Furnaces for Roasting Orcs, dto.; and I do hereby declare the following description and accompanying drawings are suf-f flcient to enable any person skilled in the art or science to which it most nearly appertains to make and use my said invention or improvements without further invention or experiment.

The nature of my inventionandimprovements consists in making the interior ofthe box or cylinder, or a portion of it, at an angle of about twenty degrees from the axis of revolution, so that, as the cylinder or box is turned, the ore will, by its own gravity, roll alternately from one end toward the other at every revolution of the cylinder; and in ar ranging the journals of the cylinder or box diagonally opposite to each other; also, in mak" ing openings in the ends of the box or cylinder or hollow journals, for supplying an d disch arg- In these drawings, G is the outside of the cylinder; and D D the ends, and E E thehollow journals, of the cylinder. A is a wedgeshaped cylindrical incline, on the lower side of the cylinder C, beginning just below the opening in the journal E and extending about two-thirds of the length of the cylinder, at an angle of about twenty degrees to the axis of the cylinder C. A section of this on the line w is shown in Fig. 4. This incline A, when the cylinder is in the position shown, causes the ores being roasted to roll from the high part of the incline next to journal toward and to the opposite end of the cylinder as the cylinder is turned in the process of roasting the ore. The incline B is similar to the incline A, and arranged diagonally opposite toitin the cylinder C, as shown in the drawings, and Fig.

3 is a cross-section of it on the lineyy. This incline B causes the ores being roasted to roll in a direction opposite 4to that they roll on the incline A as the cylinder is turned, so that the Aore is kept constantly in motion as the `cylinder is turned, rolling or sliding alternately in each direction from both ends of the cylinder.

My improved cylinder may be made of cast or wrought iron, or partly of both, and the inclines A and B may be made of the same materials, or such others as will answer the purpose, as brick or cement, proper `brackets or stays being provided "to hold the brick and cement in place. Thismcylinder maybe made of iron without the partsrepresented outside of the inclines A and B, if it issupported by the journals; or, if not supportedby the journals, it may be provided with ribs or flanges onthe outside concentric withits axis of revolution, which ribs may be 1 groovcd for the chains running over pulleys, which turn and t hold up the cylinder, which may be `steadied t UNITED' STATES PATENT Fr-wa by friction-rollers;` or the cylinder may be turned by wheels or pulleysarranged under` it, which pulleys may have ribs working in the grooves in the ribs on "the cylinder, so as L to turn it without chains. This cylinder may be provided with afurnaceto `roast the ores in it and a chimney to conduct oif the smoke, such as are shown and described in my Patent No. 60,134, and dated December 4, 1866, or such other kind of furnace or chimney as will answer the purpose. The cylinder may also be provided with a door on the side, for charg ing and discharging the cylinder, when re quired; or it may be charged and discharged t through the journals or` openings in the ends.

In operating this cylinder, a charge is putin, and, as the cylinder is turned, all the ore is caused to roll or slide down the incline A in the rst half of the revolution, and in the next halfrevolution the ore rolls or slides back again on the incline B,.so that all the pieces or particles of ore are kept constantly in motion, backward and forward, and perfectly exposed to the oxidizing influence of the heat and air in the cylinder.

What I claim as my invention and improvement in cylindrical rotary furnaces for roast ing ores, 8vo., is-

l. Making or arranging the interior f the boX or cylinder at an angle with or to the aXis of revolution, substantially as described, so that, as the cylinder or boX is turned, the contents will, by their own gravity, roll or slide alternately from one end toward the other at each revolution of the cylinder.

2. Making the journals at the ends of the cylinder diagonally opposite to each of the incline-S or interior Working-surfaces of the cylinder.

3.v In combination with a-box or cylinder having its journals arranged diagonally to lts interior inclines or Working surfaces, as described, making openings in the ends or hollovr Y journals for the blaze and heat to enter the cylinder to roast the ores, or for supplying and discharging the ores to be roasted.

WILLIAM BRUCKNER'. Vitnesses HENRY GRANNIs, ED. C. PARMELEE. 

